Recent questions tagged load

asked May 7, 2020 by anonymous

Explain MCB and ELCB with connection diagram supplying single phase load.

Last answer: OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.

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195 views 1 answer

asked Apr 16, 2020 by anonymous

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

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84 views 0 answers

asked Mar 19, 2020 by anonymous

KVL solved problem non linear load VI characteristics equation

Last answer: https://youtu.be/fgQTs-1hq7Q

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42 views 1 answer

asked Oct 13, 2019 by anonymous

Single-phase mid-point controlled rectifier with RL load

Last answer: Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

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89 views 1 answer

asked Oct 13, 2019 by anonymous

Class A Load Commutation

Last answer: Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off.

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111 views 1 answer

asked Oct 13, 2019 by anonymous

Single-phase Midpoint controlled rectifier with Resistive load

Last answer: Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

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131 views 1 answer

asked Jul 26, 2019 by anonymous

Define for polyphase circuit (i) Balanced load (ii) Unbalanced load. Draw one example circuit for each type of load.

Last answer: i) Balanced Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts. Example circuit: ii) ... satisfy the condition of balance, then it is called as unbalanced load. Example circuit:

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65 views 1 answer

asked Jul 24, 2019 by anonymous

Compare base load plant with peak load plant.

Last answer: Sr.No. Points Base load plant Peak load plant 1 Definition The power plant which supplies base load of load curve is known as base load plant The power ... power station Small capacity storage hydro, pumped storage hydro, gas, diesel power station.

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87 views 1 answer

asked Jul 24, 2019 by anonymous

Explain the concept of following terms : (i) Connected load (ii) Maximum demand

Last answer: 1. Connected Load: It is the sum of load of all equipment's connected to supply system which are in use or not in use of each consumer. OR The sum of connected load of all consumers ... is the maximum load which a consumer uses at a particular time period out of his total connected load.

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61 views 1 answer

asked Jul 5, 2019 by anonymous

Why does the speed of a DC shunt motor decrease as the load increases?

Last answer: Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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2.5k views 1 answer

asked Sep 29, 2018 by anonymous

Define the terms: i) Tariff ii) Fuel surcharge iii) Electricity Duty iv) Connected load

Last answer: i) Tariff: The rate at which a consumer is charged for the consumption of electricity is called as tariff. OR The amount of money framed by the supplier for the supply of electrical energy ... is the total wattage of all appliances which are used by the consumer on his sanctioned connection.

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95 views 1 answer

asked Sep 27, 2018 by anonymous

Define black out

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62 views 0 answers

asked Sep 22, 2018 by anonymous

Define the following terms related to tariff: (i) Connected load (ii) Unit consumed (iii) Fixed charges (iv) Electricity Tax

Last answer: (i) Connected load It is the sum of the power ratings (Watts or kW or MW) of all devices and machines existing (installed) in the premises of consumer. It is used to decide the ... a percentage of the total electricity bill which includes all amounts that go to the electricity supply agency.

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406 views 1 answer

asked Sep 22, 2018 by anonymous

Define the following: i) Residential load ii) Industrial load

Last answer: i) Residential load: The electrical load which is used in residential installation is called as residential load. E.g. incandescent lamp, florescent tube, fan ,5A socket &15A socket etc. ii ... 3-ph any type of motor, electric furnace ,oven,welding transformer and any power load etc.

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69 views 1 answer

asked Sep 8, 2018 by anonymous

Compare base load plant with peak load plant on any two points.

Last answer: Points Base load plant Peak load plant Definition The power plant which supplies base load of load curve is known as base load plant The power plant which supplies ... ,thermal,nuclear power station Small capacity storage hydro,pumped storage hydro,gas,diesel power station.

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66 views 1 answer

asked Sep 8, 2018 by anonymous

State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant.

Last answer: 1. Because of following points Nuclear power plant used as base load power plant:- 1. Nuclear power plants is very economical for producing bulk amount of electric power 2. Nuclear power plant is reliable ... . The plants can be put on load easily. 4. Diesel engines take less time to make OFF.

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56 views 1 answer

asked Sep 8, 2018 by anonymous

Explain with diagram load duration curve.

Last answer: It is drawn from load curve. It is graph of load (MW/KW) arranged in descending order of magnitude with respect to time.

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91 views 2 answers

asked Sep 7, 2018 by anonymous

Define each of following terms: i) Connected load ii) Spinning reserve.

Last answer: i) Connected Load :- It is the sum of load of all equipment connected to supply system which are in use or not in use of each consumer. ii) Spinning Reserve:- It is reserved generating capacity in operation and connected to bus bar and ready to take a load.

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46 views 1 answer

asked Sep 7, 2018 by anonymous

Define balanced 3 phase load.

Last answer: Balanced 3 phase Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts. It takes same current of equal magnitude and equal phase angle.

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57 views 1 answer

asked Sep 6, 2018 by anonymous

Define balanced and unbalanced load in three phase circuit.

Last answer: Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced. Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.

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55 views 1 answer

asked Sep 5, 2018 by anonymous

Define load and line regulation.

Last answer: 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.

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47 views 1 answer

asked Aug 12, 2018 by anonymous

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

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172 views 0 answers

asked Jun 18, 2018 by anonymous

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Last answer: An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

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205 views 1 answer

asked Jun 18, 2018 by anonymous

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

Last answer: A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

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2.6k views 1 answer

asked May 8, 2018 by anonymous

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last answer: A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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402 views 1 answer

asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

Last answer: A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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219 views 1 answer

asked May 8, 2018 by anonymous

In load flow Study, a PV bus is treated as a PQ bus when

Last answer: Voltage at the bus becomes high

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2.4k views 2 answers

asked May 8, 2018 by anonymous

The following formula is correct:

The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

Last answer: The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

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asked May 1, 2018 by anonymous

Load flow studies involve solving simultaneous

Load flow studies involve solving simultaneous (1) linear algebraic equations. (3) linear differential equations. (2) non-linear algebraic equations. (4) non-linear differential equations.

Last answer: Load flow studies involve solving simultaneous non-linear algebraic equations.

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404 views 1 answer

asked Apr 30, 2018 by anonymous

Load factor is the

Load factor is the (1) Ratio of maximum load on the station to sum of consumer's maximum load. (2) Ratio of average demand to maximum demand. (3) Factor used for increasing load. (4) Reciprocal of (1).

Last answer: Load factor is the Ratio of average demand to maximum demand.

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61 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer has negative voltage regulation when its load power factor is

A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging

Last answer: Leading

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1.0k views 2 answers

asked Apr 30, 2018 by anonymous

The load duration curve for unity load factor will be of

The load duration curve for unity load factor will be of (1) Rectangular shape (2) Triangular shape (3) L -shape (4) I -shape

Last answer: The load duration curve for unity load factor will be of Rectangular shape

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228 views 1 answer

asked Apr 30, 2018 by anonymous

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

Last answer: A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V

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137 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is :

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last answer: A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency

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159 views 1 answer

asked Apr 30, 2018 by anonymous

Generally in a power system network, the load is represented as a :

Generally in a power system network, the load is represented as a : (A) Constant power in both load flow study and in stability study (B) Constant power in load flow study and constant impedance in stability study (C) Constant power in stability study and constant impedance in load flow study (D) Constant impedance in both load flow study and in stability study

Last answer: Generally in a power system network, the load is represented as a : Constant power in load flow study and constant impedance in stability study

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75 views 1 answer

asked Apr 30, 2018 by anonymous

In tuned power lines, on load :

In tuned power lines, on load : (A) the receiving end voltage is numerically equal to the sending end voltage (B) the receiving end current is numerically equal to the sending end current (C) there is no voltage drop (D) all the above

Last answer: In tuned power lines, on load : (A) the receiving end voltage is numerically equal to the sending end voltage (B) the receiving end current is numerically equal to the sending end current (C) there is no voltage drop (D) all the above

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55 views 1 answer